Roller-mill



(No Model.) 2 Sheets-Sheet 1.

L. E. KRUGER. ROLLER MILL.

No. 440,480. Patented Nov. 11, 1890.

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(No Model.) 2 Sheets-Sheet 2.

L. E. KRUGER.

V ROLLER MILL. N9. 440,480. Patented Nov. 11, 1890.

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/ N VE N 70/? By m g ATTORNEYS UNITED STATES PATENT OFFICE.

LOUIE EDVARD KRUGER, OF CANTON, SOUTH DAKOTA.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 440,480, dated November11, 1890.

Application filed January 23, 1890. Serial No. 337,839. (No model.)

To all whom it may concern.-

Be it known that I, LOUIE EDWARD KRU- GER, of Canton, in the county ofLincoln and State of South Dakota, have invented a new and ImprovedRoller-Mill, of which the following is a full, clear and exactdescription.

This invention relates to roller-mills, the object of the inventionbeing to provide for the continuous treatment of stock in a manner suchthat after the first reduction all particles that are of a sufficientdegree of fineness will be sifted out, and will gradually pass downward,being joined on the way by other particles of the required fineness thatare produced by other sets of rolls with which the machine is provided,the final result being the delivery of the bran and of the flour andmiddlings in separate streams.

To the ends above named the invention con sists of certain novelconstructions, arrangements, and combinations of elements, which will behereinafter fully described, and specifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures and letters of referenceindicate corresponding parts in all the views.

Figure 1 is a side View of my improved roller-mill. Fig. 2 is a verticalcentral sectional elevation of the mill transversely through its rollsand screens on the line w m, Fig. 3. Fig. 3 is a sectional plan view onthe broken line y y of Fig. 2. Fig. 4 is aview of that side of the millthat is opposite the one illustrated in Fig. 1, and Fig. 5 is an endview of the mill.

In the drawings, representsthe main frame of the mill, which said frameis provided with bearings adapted to receive the journals roof the lowerrolls 11, 12, 13, and 14, as many of these rolls being provided as maybe deemed desirable. Above the rolls 11, 12, 13, and 14 there aremounted upper rolls 11, 12 13*, and 1 1*, said rolls being journaled inarms 15, 16, 17, and 18, that are pivotally attached to the frame 10,the roll-shafts extending outward through slots Z7, that are formed inthe frame or casing 10. Upon the inner ends of the arms 15 to 18 thereare formed eyes a, through which eyes there are passed threaded shafts20, one of said shafts being arranged at each side of the machine, and'each shaft being provided with a central enlargement 21, formed with arecess 6, adapted to receive an eccentrically-arranged pin f, such pinsextending outward from the ends of the shaft 25. This shaft is providedwith a leverarm or handle 26, in connection with which there is arrangeda segmental rack 27.

Upon the shaft 20 there are mounted adjusting-nuts g and g, a pair ofthese nuts being arranged in connection with each of the arms 15, 16,17, and 18, whereby any arm may be so adjusted as to bring its roll tothe required position should the adjustment of the roll alter, owing tothe wearing of the bearings or from any other cause, and whereby all ofthe upper rolls may be simultaneously adj usted by simply throwing thelever 26, this latter adjustment being desirable in order that theseveral pairs of rolls may be operated properly upon different styles orclasses of grain.

Within the casing or frame 10, I arrange an upper sieve 30, so locatedas to receive the stock after it passes between the rolls 11 and 11 andto deliver a portion of the stock to the rolls 12 and 12, all thematerial that has been sufficiently reduced passing through the sieveand onto a plate 30, to pass thence to funnels 31, which lead downwardthrough a sieve 32, that is arranged to receive the material after ithas been acted upon by the rolls 12 and 12% The funnels 31 deliver to aplate 32, which in turn delivers to funnels 31, that pass through athird sieve 33, the material passing through the funnels 31 being caughtby a plate 33 which delivers to funnels 31*, which pass through sieves34: and deliver to a plate 34.

The sieves and plates above referred to are connected to external frames40, that are in turn supported by levers 41, such levers being fulcrumedat the points marked 1', and the connection between the frames 40 andthe levers being a pivotal connection. The free ends of the levers 40rest upon eccentrics h, that are carried by a shaft 42, so that if theshaft 42 be revolved a vertical reciprocating motion will be imparted tothe frames 40, and consequently to the sieves and plates that aresupported by such frames, connections between the sieves and framesbeing established by rods that extend outward through slots formed inthe walls of the easing 10.

Referring now to Fig. 1 it will be seen that the rolls 11, 12, 13, and 11 carry pulleys 70, about which pulleys there is passed a drivingbelt50, such belt extending upward from a driving-pulley andtightenerpulleys not shown in the drawings, and following the courseindicated in the figure last above referred to, passing upward from thepulley k, which is carried by the roller 13, to and about a pulley whichis carried by the shaft 42, and thence downward to the driving-pulley.

Upon the opposite side of the machine, as shown in Fig. 4, the rolls 11,12, 13, and 14 are provided with pulleys about which there is passed adriving-belt 50, which runs as indicated. The belt 50 (see Fig. 4)passes directly from the drive-pulley to the roll-pulleys is"; butbetween the right-hand pulleys it is looped around a tightener-pulleynear the lower end of the frame.

Among the advantages arising from the use of such a mill as abovedescribed is what follows: The wheat to be ground can be heated beforeentering between the first pair of rolls, and as all particles aregradually reduced in quick succession the reheating of the wheat willnot be necessary. The vertical reciprocating motion imparted to thesieves and plates prevents all clogging of the sieves and provides for aproper clear separation. The driving-belts 50 and 50 are adjusted sothat their action will tend to draw the rolls together, and the beltsare so arranged as to overcome any tendency to shift the rolls fromtheir normal parallel position. It will be understood that thetightener-pulleys, around which the belts 50 50 pass, are in' practiceto be adjustable, so that the tension of the belts may be adjusted totake up slack or relieve them from undue strain from the movements ofthe rollers. The said tighteners or idlers are so located as to pull therolls to their work.

By providing for the discharge of the fine material from plate to plateI secure a single discharge-stream of such material and overcome thenecessity of removing the material after it has passed between each pairof rolls. By providing an adjusting attachment which is common to all ofthe rolls, and one by means of which any particular roll may beadjusted,I overcome many of the objections heretofore found with theexisting types of roller-mills.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent 1. A roller-millcomprising the frame, vertically-aligned pairs of rolls 11 11 and 13 13at one side of the frame, vertically-aligned pairs of rolls 12 12 14.-14 at the opposite side of the frame, the pairs of levers 15 16 17 1S,pivoted at their outer ends to the frame, extending inwardly, the innerends of the opposite pairs of levers overlapping each other and havingvertically-aligned apertures at their said overlapped inner ends, theupper roll of each pair being mounted on one pair of said levers,vertical screw-threaded adj usting-shafts extending down through theapertured overlapped ends of the said levers and provided with nutsbetween which the ends of saidleversareheld,arecesse,providedbetween theends of each shaft, a transverse shaft extending through the frame andprovided with eccentrics at its ends entering said recesses e, and anoperating-lever, means for locking the lever at various points tosimultaneously adjust the workingfspace between the rolls and regulatethe fineness of the grind, and inclined screens and plates between theseveral pairs of rolls, substantially as set forth.

2. In a roller-mill, the combination, with the frame and the rolls, ofthe inclined vertically-reciprocatin g upper and lower screens, theopposite vertically-reciprocating frames 40, mounted in bearings on theframe and having rods projecting inwardly through slots in the frameinto connection with said screens, horizontally-extending levers 41,pivoted at one end to the frame at opposite sides thereof and engagingthe frames 40 between their ends, and rotary cams or eccentrics .Onwhich the free ends of said levers rest, substantially as set forth.

3. The combination of the frame, the pairs of rolls 11 11 12 12 13 13 1414, pulleys 70 on rolls 11, 12, 13, and 14 at the side of the frame,pulleys is on the ends of rolls 11, 12, 13, and 14 at the opposite sideof the frame, the rolls of each pair being one above the other,inwardly-projectinglevers on which the upper rolls of each pair of rollsare journaled, said levers being connected for simultaneous movement, adriving-belt 50, pass ing around the several pulleys 7s, and a pulley42, and the belt 50, passing over the pulleys 70, and an idler for eachbelt located to pull the rolls to their work, substantially as setforth.

LOUIE EDNVARD KRUGER.

Witnesses:

DETLEF 1-1. SMITH, AMos SEVERTSON.

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